| 摘要 |
PURPOSE:To independently determine detection limits of momentary break and the breaking of singal throuh causing the limit of the detection mark rate to aproach 0 or 1, integrating circuit, which has a time constant longer than that of the first integrating circuit connected to the FF, with the reference voltage. CONSTITUTION:When the pulse period of input signal 1 is sufficiently shorter than time constant R1C1 of integrating circuit 14, the level of output signal 4 of integrating circuit 14, the level of output signal 4 of integrating circuit 17 does not reach the threshold and does not generate the alarm signal if input signal 1 is given to clock input terminal C of FF11. When the pulse period of input signal 1 is sufficiently longer than time constant R1C1, the level of output signal 4 increases and exceeds the threshold voltage to generate alarm. When a momentary break sufficiently shorter than time constant C2R2 of integrating circuit 17 is generated in input signal 1, the level of output signal 4 does not reach the threshold and does not generate alarm; but if instantaneous breaking or the breaking of singal sufficiently longer than time constant C2R2 is generated in input signal 1, the level of output signal 4 increases and exceeds the threshold to generate alarm. |
